2023-09-18 14:09:00
Blood pressure is the pressure that blood exerts once morest the walls of the arteries.
Better understand the cardiac cycle to understand blood pressure
“The cardiac cycle is perceptible to the ear in the form of 2 noises and 2 silences, one small and one large”indicates the French Federation of Cardiology.
- The 1is noise corresponds to the closure of the mitral and tricuspid valves; this is the start of 1is cardiac cycle time or systole (from the Greek word meaning contraction) ;
- The 1is silence, which follows, corresponds to the moment when the ventricles simultaneously eject their blood contents both towards the lungs and both towards the viscera and the tissues; when the heart contracts to empty itself, this is called systolic pressure.
- The 2e noise corresponds to the closing of the valves separating the aorta and the pulmonary artery from the ventricles.
- The 2e silence is the moment when the ventricles relax and fill with blood… before preparing for the next systole. The moment when the heart relaxes to fill is the diastolic pressure.
Together, the 1is noise and the 1is silence corresponds to systole; the 2e e noise and the 2e silence corresponds to diastole.
On the side of the arteries, during the 1is silence of systole, we observe a dilation facilitating the correct circulation of blood. At the time of 2e silence, the artery returns to its position by contracting… and propels blood throughout the body.
Systolic blood pressure and diastolic blood pressure, kesako?
During systole, once the mitral and tricuspid valves are closed, the heart contracts and expels blood at its maximum pressure: this pressure is the systolic blood pressure.
During diastole, the heart relaxes to fill with blood, the pressure is minimal: this is the diastolic blood pressure.
What is normal blood pressure?
When we measures blood pressurewe note 2 figures:
- The highest number corresponds to the systolic pressure.
- The lower number corresponds to the diastolic pressure.
A normal blood pressure is generally 120/80 – i.e. a systolic pressure of 120 mm of mercury and a diastolic pressure of 80 mm of mercury -. We talk regardinghigh blood pressure when the diastolic and systolic pressure exceed 140 and 90 mm of mercury, respectively.
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